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Salt stress, Thylakoid membrane, Pigment-protein complex, PS II, Thermoluminescence, Mung bean ( Vigna radiata L.), Indian mustard (Brassica juncea Coss.)In the present study, mung bean (Vigna radiata L.) -a salt susceptible and Indian mustard (.Brassica juncea L.) -a salt resistant crop was studied to find out the differences in stress responses of these crops. Seedlings were grown in water soaked cotton under continuous illumination of 35 (.imole m 2 s 1 at 26 ± 1 °C. Salinity treatment of 0, 0.5 and 1.0% (w/v) was given to the seedlings at 6 day Photosynthetic pigment content and PS II electron trans port activity was reduced under salinity in both mung bean and Indian mustard. The pigment protein pattern of both the crops were similar. Ratio analysis of B and Q thermolumines cence (T L ) glow peaks suggested that S2Q a-charge recombination was relatively more af fected than S2/?Qb-charge recombinations.

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The salt susceptible rice (Oryza sativa L.) cv. Jaya and salt resistant cv. Damodar seed germination and seedling growth rates were studied in laboratory and field conditions. The effect of salinity on seed germination, shoot and root length, seedling vigour index (SVI) and increase in the root: shoot length ratio in the laboratory was relatively more in cv. Jaya than in cv. Damodar. The relative susceptibility to salinity was more in cv. Jaya than in cv. Damodar in the field also. However, their responses varied with growth period. The root: shoot length and fresh and dry weight ratios increased with salinity at 15 days in cv. Jaya. The root: shoot fresh and dry weight ratio decreased with salinity at 15 days in cv. Damodar. However, the root: shoot fresh weight ratio decreased with salinity at 25 days in the susceptible cv. Jaya. The root and shoot length fresh and dry weight of cv. Damodar was enhanced at 0.5% (w/v) NaCl treatment compared to the control seedlings at 25 days. SVI in cv. Jaya decreased with salinity in the laboratory and field conditions. SVI in cv. Damodar, SVI showed little change at 15 days but decreased with salinity of 1–3% NaCl with an enhancement at 0.5% NaCl level in the laboratory and at 25 days in field conditions.

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